1 /* Definitions for POSIX memory map interface. Linux/x86_64 version. 2 Copyright (C) 2001-2012 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <http://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_MMAN_H 20 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead." 21 #endif 22 23 /* The following definitions basically come from the kernel headers. 24 But the kernel header is not namespace clean. */ 25 26 27 /* Protections are chosen from these bits, OR'd together. The 28 implementation does not necessarily support PROT_EXEC or PROT_WRITE 29 without PROT_READ. The only guarantees are that no writing will be 30 allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ 31 32 #define PROT_READ 0x1 /* Page can be read. */ 33 #define PROT_WRITE 0x2 /* Page can be written. */ 34 #define PROT_EXEC 0x4 /* Page can be executed. */ 35 #define PROT_NONE 0x0 /* Page can not be accessed. */ 36 #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of 37 growsdown vma (mprotect only). */ 38 #define PROT_GROWSUP 0x02000000 /* Extend change to start of 39 growsup vma (mprotect only). */ 40 41 /* Sharing types (must choose one and only one of these). */ 42 #define MAP_SHARED 0x01 /* Share changes. */ 43 #define MAP_PRIVATE 0x02 /* Changes are private. */ 44 #ifdef __USE_MISC 45 # define MAP_TYPE 0x0f /* Mask for type of mapping. */ 46 #endif 47 48 /* Other flags. */ 49 #define MAP_FIXED 0x10 /* Interpret addr exactly. */ 50 #ifdef __USE_MISC 51 # define MAP_FILE 0 52 # define MAP_ANONYMOUS 0x20 /* Don't use a file. */ 53 # define MAP_ANON MAP_ANONYMOUS 54 # define MAP_32BIT 0x40 /* Only give out 32-bit addresses. */ 55 #endif 56 57 /* These are Linux-specific. */ 58 #ifdef __USE_MISC 59 # define MAP_GROWSDOWN 0x00100 /* Stack-like segment. */ 60 # define MAP_DENYWRITE 0x00800 /* ETXTBSY */ 61 # define MAP_EXECUTABLE 0x01000 /* Mark it as an executable. */ 62 # define MAP_LOCKED 0x02000 /* Lock the mapping. */ 63 # define MAP_NORESERVE 0x04000 /* Don't check for reservations. */ 64 # define MAP_POPULATE 0x08000 /* Populate (prefault) pagetables. */ 65 # define MAP_NONBLOCK 0x10000 /* Do not block on IO. */ 66 # define MAP_STACK 0x20000 /* Allocation is for a stack. */ 67 # define MAP_HUGETLB 0x40000 /* Create huge page mapping. */ 68 #endif 69 70 /* Flags to `msync'. */ 71 #define MS_ASYNC 1 /* Sync memory asynchronously. */ 72 #define MS_SYNC 4 /* Synchronous memory sync. */ 73 #define MS_INVALIDATE 2 /* Invalidate the caches. */ 74 75 /* Flags for `mlockall'. */ 76 #define MCL_CURRENT 1 /* Lock all currently mapped pages. */ 77 #define MCL_FUTURE 2 /* Lock all additions to address 78 space. */ 79 80 /* Flags for `mremap'. */ 81 #ifdef __USE_GNU 82 # define MREMAP_MAYMOVE 1 83 # define MREMAP_FIXED 2 84 #endif 85 86 /* Advice to `madvise'. */ 87 #ifdef __USE_BSD 88 # define MADV_NORMAL 0 /* No further special treatment. */ 89 # define MADV_RANDOM 1 /* Expect random page references. */ 90 # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 91 # define MADV_WILLNEED 3 /* Will need these pages. */ 92 # define MADV_DONTNEED 4 /* Don't need these pages. */ 93 # define MADV_FREE 8 /* Free pages only if memory pressure. */ 94 # define MADV_REMOVE 9 /* Remove these pages and resources. */ 95 # define MADV_DONTFORK 10 /* Do not inherit across fork. */ 96 # define MADV_DOFORK 11 /* Do inherit across fork. */ 97 # define MADV_MERGEABLE 12 /* KSM may merge identical pages. */ 98 # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */ 99 # define MADV_HUGEPAGE 14 /* Worth backing with hugepages. */ 100 # define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages. */ 101 # define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, 102 overrides the coredump filter bits. */ 103 # define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */ 104 # define MADV_WIPEONFORK 18 /* Zero memory on fork, child only. */ 105 # define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK. */ 106 # define MADV_COLD 20 /* Deactivate these pages. */ 107 # define MADV_PAGEOUT 21 /* Reclaim these pages. */ 108 # define MADV_POPULATE_READ 22 /* Populate (prefault) page tables 109 readable. */ 110 # define MADV_POPULATE_WRITE 23 /* Populate (prefault) page tables 111 writable. */ 112 # define MADV_DONTNEED_LOCKED 24 /* Like MADV_DONTNEED, but drop 113 locked pages too. */ 114 # define MADV_COLLAPSE 25 /* Synchronous hugepage collapse. */ 115 # define MADV_HWPOISON 100 /* Poison a page for testing. */ 116 #endif 117 118 /* The POSIX people had to invent similar names for the same things. */ 119 #ifdef __USE_XOPEN2K 120 # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ 121 # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ 122 # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ 123 # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ 124 # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ 125 #endif 126 127 #define MFD_CLOEXEC 1U 128 #define MFD_ALLOW_SEALING 2U 129 #define MFD_HUGETLB 4U 130